The Underground at Facebook has four reviews: 5 stars, 5 stars, 5 stars, and one guy who dares ask what's up with reracking the dishes? The secret to success seems to be executive chef Josef Desimone, a steal from Google who brought several of his buddies over. Valleywag scored spy photos of the place in August. I confess I'm eyeing that plate of sushi and my résumé right now. Sheryl Sandberg can't be all that bad to work for, especially right after lunch. (Photo by donn l.)